Gear unit



FIG. 1 is a front-side-top perspective view of a gear unit showing a first embodiment of our new design;

FIG. 2 is a rear-side-top perspective view of the embodiment of FIG. 1;

FIG. 3 is a front view of the embodiment of FIG. 1;

FIG. 4 is a rear view of the embodiment of FIG. 1;

FIG. 5 is a view of one side of the embodiment of FIG. 1, with the appearance of the other side, the top, and the bottom of the gear unit being identical to this figure; and,

FIG. 6 is a side view of a gear unit showing a second embodiment of our new design, with the appearance of the other side, the top, and the bottom of the gear unit being identical to this Figure. 

The ornamental design for a gear unit, as shown and described. 